Just out of relative curiosity, what are the rough estimates on cost for each of these mods?

Intercooler?

Downpipe?

Catback exhaust?

Uwhusky, you have all the items installed, however they are stock BMW parts that are somewhat restrictive. In order to run Maps besides stage 1 you would need to upgrade certain components to allow the tune to work its magic of giving you more POWER. For instance stage 1+ fmic(front mounted inter cooler) aggressive, your car needs 93 octane and a upgraded inter cooler to cool a larger volume of air. The pricing for most of the items above is ~$800 to $$$$$$$$$$$$$$$$$. If you want more power then the stage 1 map you need to do some upgrading. The DCI you are looking at will help your car breathe easier and is a step in the right direction. I'm going to look at a drop in intake though for my car.